Sponge holder



FIG. 1 is a perspective view of a sponge holder;

FIG. 2 is a front view thereof; the rear view being a mirror image thereof;

FIG. 3 is a left elevation view thereof, the right elevation view being a mirror image thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The broken lines in the drawings depict portions of the sponge holder that form no part of the claimed design. 

CLAIM The ornamental design for a sponge holder, as shown and described. 